fix: apply review feedback — nil HttpClient, local dedup type

- Return nil instead of real http.Client in unsupported host test
- Move skillResultKey type inside deduplicateResults function scope

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pkg/cmd/skills/publish/publish_test.go

@@ -164,7 +164,7 @@ func TestPublishRun_UnsupportedHost(t *testing.T) {
 		IO:         ios,
 		Dir:        dir,
 		GitClient:  &git.Client{},
-		HttpClient: func() (*http.Client, error) { return &http.Client{}, nil },
+		HttpClient: func() (*http.Client, error) { return nil, nil },
 		host:       "acme.ghes.com",
 	})
 	require.ErrorContains(t, err, "supports only github.com")

pkg/cmd/skills/search/search.go

@@ -770,17 +770,15 @@ func fetchPrimaryPages(client *api.Client, host, query string, displayPage, disp
 	return allItems, totalCount, nil
 }
 
-// skillResultKey is a typed map key for deduplicating code search results
-// by (repo, namespace, skill name). All fields are lowercased for
-// case-insensitive comparison.
-type skillResultKey struct {
-	repo      string
-	namespace string
-	skillName string
-}
-
 // deduplicateResults extracts unique (repo, namespace, skill name) triples from code search hits.
 func deduplicateResults(items []codeSearchItem) []skillResult {
+	// skillResultKey is a typed map key that deduplicates by (repo, namespace,
+	// skill name). All fields are lowercased for case-insensitive comparison.
+	type skillResultKey struct {
+		repo      string
+		namespace string
+		skillName string
+	}
 	seen := make(map[skillResultKey]struct{})
 	var results []skillResult